Process of molding fibrous pulp



COATING R PLASTIC .UNITED STATE Cross Reference PATENT. OFFICE-- JAMES A. WHEELER, or oswEGo, PEW oR PROCESS OF MOLDING FIBROUS PuLP.

srscmxca'rrox forming part of Letters pp t filed March 24. 1894. sfliil Ho- 504,995. (No specimens) T0 till 1072-0171, it may concern.-

Be it known that 1, James A. WHEELER, of Oswego, in the county of Oswego, in the State of New York, have invented new and use- 5 ful Improvements in Processes of Molding Fibrous Pulp, of which the following is a full, clear, and exact description.

This invention is designed to be used in the manufacture of bath-t ubs, bu rial-caskets and other articles inclndingflattile or boards from fibrous pulp, more especially from wood-pulp, except in articles where it is necessary to make tlgem fire-proof, in which case I use asbestos fi er.

The object of the invention is to impart to V v the molded article greater rigidity and hard-,

ness and render it impervious to water and in certain cases to make it fire-proof and to that end the invention consists in the successive steps of the treatment of the pulp preparatory to and during the process of molding the same into the required shape and subsequent treatment of the molded article, ashereinafter described ,and specifically I set forth in the :5 claim.

- In practicingm y invention I proceed as follows; I take anysnitable fibrous ul preferably wood-pulp which I moisten with clear water, pre era y hot water at or near 1101 ing 0 point which has the advantage of melting or dissolving such articles as may be used to combine together the different materials hereinafter described, also of facilitating the drying of the article itself. \Yith this water I moisten the pulp so as to render it pasty and while in this condition I thoroughly mix therewith sodium silicate or silicate of potash known as soluBle lass to ma 0 a oug y body of the compound, which I thoroughly o knead and which when molded and exposed Wair or artificial heat possesses the property of being gradually converted into a gelatinous mass which finally solidifies.

IVhen it is desirable to make the article Patent No. 539,928, dated May 28, 189 5.

added to white prod does such shade of coloror tints as may be desired,) I mix with anysuitable fibrous pulp moistened with water as 5; described or with the aforesaid compound, white-lead orzinc-white or the ordinary air or water s a 'ed"" Tl mc'-1me or uick-lime slaked WHICII gives ll. a [HUGE WEIEGI Color, 01 WEltlD" in such quantities as maybe desired or'd'e oTfie d advisable to produce a white mass, which atterward for 1 insoluble soa in dconnection with resins or gums when Eeate as proposed. Said resins or gums are to be in a pulverous condition when introduced into the above materials heated by water as aforesaid and they may while beingformed into the desired article or after the-article is formed, be subjected to additional heat sufiicient to melt the resins or gu ms whic ev lop into a homogeneous mass which will then harden directly when exposed to the ordinary temperature and will continue to harden intoa very rigid body of a beautiful luster and is not then affected by extremely hot water, which especially adapts it for bath-tubs and analogous articles where it comes into use with alkali soaps and hot water. I further improve the compound by adding to the fibrous pulp (treated as aforesaid),the following materials, namely: Calcined ulverized'ma nesite soaked in chloride of ma"; -f-r-'r""1 T'- ggl 5 stea as for instance, oxide of galcium, oxide 8 of barium or other on es, ant Wl earth 021' 13c WHlGll oxides I may soak with the chic nde of the afgrgsaid substances e1t erbeiore oratt etimeo a lngt em to hecompounds as stated, or I may use said chloride as a corresponding bath as hereinafter stated for the molded article. v

The mixture '1 kneador beat up by means of a suitable implement or appliance and then mold it in between dies or molds prepared for the purpose. The material is allowedtosetor harden I in" the molds outaken out and baked in a suitable kiln at a temperature of about co dition which allows the article to be finished by either a. cutting or an abrading or of colors produced from white, (asit is a well known fact that any color pigment or dye polishing tool. 1 I

Articles containing the magnestte or. its

new/l5 the desired shape by forcing it 27%" and is thereby dried and hardenedto'sT ro' :5 rials named, a hard smooth lustrou equivalent as before stated may be further hardened by a solution of chloride of magnesia or other chlorides as previous y s e which may be ither Brushed or s ra ed there- 5 on or applied by immerslng the molded article in a bath of sa article as aforesaid.

As an additionalfinish to the molded article before described (with the exception of the n 1011 efore baking the ID fire-proof articles) they may be subjected to a hot bath f r. m issolved in melted parfimne which hardens quic y w en exfirst moistening thepulp with water and mixing therewith sodium silicate or its described equivalent, then kneading the compound and adding thereto pulverized calcined magnesite sulficient to convert said compound into a doughy body, then mixing therewith pulverized quick-lime, then adding pulverized resins o'r gums, then heating and molding the mass,

then drying or baking the molded article and finally subjecting the same to a bath formed of a solution of chloride of magnesia or other chlorides as hereinbet'ore stated.

In testimony whereof I have hereunto signed my name this 10th day of March, 1894.

JAMES A. WHEELER; [L. s.] Witnesses:

K. BURKE,

W. H. BAKER. 

